package cn.newtouch.org.service.impl;

import cn.newtouch.basic.service.impl.BaseServiceImpl;
import cn.newtouch.org.domain.Department;
import cn.newtouch.org.mapper.DepartmentMapper;
import cn.newtouch.org.service.IDepartmentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

// @Transactional(readOnly = true,propagation = Propagation.SUPPORTS)
@Service
public class DepartmentServiceImpl extends BaseServiceImpl<Department> implements IDepartmentService {

    @Autowired
    private DepartmentMapper departmentMapper;


    @Transactional
    @Override
    public void save(Department department) {
        //返回自增的主键id
        departmentMapper.save(department);

        //调用update方法 更新到数据库
        update(department);
    }

    @Transactional
    @Override
    public void update(Department department) {
        //当前department 没有dirPath
        //1.如果没有上级部门
        if(department.getParent_id()==null){
            //获取自增主键id
            Long id = department.getId();
            //设置dirPath
            department.setDirPath("/"+id);
        }else{//2.有上级部门
            //获取父级部门id
            Long parent_id = department.getParent_id();
            //通过父级部门id 获取父级部门对象
            Department parentDepartment = departmentMapper.loadById(parent_id);
            //设置dirPath  父级部门的/id+自己的/id
            department.setDirPath(parentDepartment.getDirPath()+"/"+department.getId());
        }
        departmentMapper.update(department);
    }

    @Override
    public List<Department> deptTree() {
        // 1. 一次性查询出所有数据，放到内存中，可以使用map
        // 2. 从所有数据中找出第一层级/顶级部门：这就是我们需要返回的数据
        // 3. 遍历所有部门只要不是第一层级的，找自己的上级，并将自己放入上级的children中
        //将所有的部门撞到map中  - 每次获取父部门都从这里获取
        List<Department> all = departmentMapper.loadAll();
        Map<Long,Department> map  = new HashMap<>();
        for (Department department : all) {
            map.put(department.getId(),department);
        }

        //前端需要得到的集合数据 - 部门树
        List<Department> deptTree = new ArrayList<>();
        for (Department department:all){
            if(department.getParent_id() == null){//顶级部门
                deptTree.add(department);
            }else{//不是顶级部门
                //1.想办法找到当前部门的 父部门
                Long parent_id = department.getParent_id();
                //这种从数据库查询的方式，每次通过id去查询 - 查询出来映射给实体domain，children集合中都会是空集合 - 没有任何数据
                //Department parentDepartment = departmentMapper.loadById(parent_id);
                //下面这种是从Map中去获取的 - 以前装进去的对象还是会存在
                Department parentDepartment = map.get(parent_id);
                //2.将自己装到  父部门 的children中
                parentDepartment.getChildren().add(department);
            }
        }
        return deptTree;
    }
}
